A 20-year-old man has been charged with the murder of a retired gay lecturer in Edinburgh.

He is due to appear before Edinburgh Sheriff Court today over the death of 64-year-old Roger Gray, who taught maths and statistics at Heriot-Watt University.

Mr Gray is the third gay man to have been killed in the city in the last month but police have said there is no evidence the deaths are related.

He was found dead in the hallway of his Merchiston Crescent flat on Saturday morning after neighbours reported a gas leak.

He had been stabbed to death in a “sustained” attack, police said.

One neighbour reported hearing a disturbance the night before and it was claimed that Mr Gray’s flat had been locked from the inside.